go.mod: update wireguard-go, taking control over iOS memory usage from our fork

Our wireguard-go fork used different values from upstream for
package device's memory limits on iOS.

This was the last blocker to removing our fork.

These values are now vars rather than consts for iOS.

c27ff9b9f6

Adjust them on startup to our preferred values.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>

go.mod

@@ -26,7 +26,7 @@ require (
 	github.com/peterbourgon/ff/v2 v2.0.0
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/tailscale/depaware v0.0.0-20201214215404-77d1e9757027
-	github.com/tailscale/wireguard-go v0.0.0-20210511223652-bbf7d6cfb6ac
+	github.com/tailscale/wireguard-go v0.0.0-20210522003738-46b531feb08a
 	github.com/tcnksm/go-httpstat v0.2.0
 	github.com/toqueteos/webbrowser v1.2.0
 	go4.org/mem v0.0.0-20201119185036-c04c5a6ff174

go.sum

@@ -133,6 +133,8 @@ github.com/tailscale/wireguard-go v0.0.0-20210510192616-d1aa5623121d h1:qJSz1zlp
 github.com/tailscale/wireguard-go v0.0.0-20210510192616-d1aa5623121d/go.mod h1:ys4yUmhKncXy1jWP34qUHKipRjl322VVhxoh1Rkfo7c=
 github.com/tailscale/wireguard-go v0.0.0-20210511223652-bbf7d6cfb6ac h1:QHlYXuUunb1hGlosIDNu8JV2oyjCuLTnFROrRDo5LzM=
 github.com/tailscale/wireguard-go v0.0.0-20210511223652-bbf7d6cfb6ac/go.mod h1:ys4yUmhKncXy1jWP34qUHKipRjl322VVhxoh1Rkfo7c=
+github.com/tailscale/wireguard-go v0.0.0-20210522003738-46b531feb08a h1:ujoIjR8p8HEVy26RnOe6U5aJwaMYFrIa4cpGGeZF5oc=
+github.com/tailscale/wireguard-go v0.0.0-20210522003738-46b531feb08a/go.mod h1:ys4yUmhKncXy1jWP34qUHKipRjl322VVhxoh1Rkfo7c=
 github.com/tcnksm/go-httpstat v0.2.0 h1:rP7T5e5U2HfmOBmZzGgGZjBQ5/GluWUylujl0tJ04I0=
 github.com/tcnksm/go-httpstat v0.2.0/go.mod h1:s3JVJFtQxtBEBC9dwcdTTXS9xFnM3SXAZwPG41aurT8=
 github.com/toqueteos/webbrowser v1.2.0 h1:tVP/gpK69Fx+qMJKsLE7TD8LuGWPnEV71wBN9rrstGQ=

wgengine/mem_ios.go

@@ -0,0 +1,21 @@
+// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package wgengine
+
+import (
+	"github.com/tailscale/wireguard-go/device"
+)
+
+// iOS has a very restrictive memory limit on network extensions.
+// Reduce the maximum amount of memory that wireguard-go can allocate
+// to avoid getting killed.
+
+func init() {
+	device.QueueStagedSize = 64
+	device.QueueOutboundSize = 64
+	device.QueueInboundSize = 64
+	device.QueueHandshakeSize = 64
+	device.PreallocatedBuffersPerPool = 64
+}